This dance camp, which called itself Osiris, was located near Opulent Temple. Note the people standing inside their pyramid to get a sense of its size (it's 60 feet tall at its apex).

Their pyramid was designed by a professional structural engineer who happened to be a member of their camp. It's constructed from 36,000 lbs of recycled industrial steel, and they've made its plans available online in case you'd like to build one of your own.